Reply #5: Try this:

[Lorien]

Product description:
These open-air fully enclosed walkways allow indoor cats to enjoy the outdoors while keeping them in view and shaded. These interchangeable, connecting walkways and rooms can be configured to fit the particular shape of your yard, deck, or balcony, providing ample space for your pet’s exercise. The sections can be easily moved, disassembled, stored flat, and re-built. The durable rip-stop nylon netting and metal wickets are weather resistant, portable, and sturdy. Each enclosure has removable door panels that tie shut, or open to connect to other components—or even to abut a pet door. Winner of “Best New Product” award from Pet Age and an “Editor’s Choice” award from Cat Fancy. 30% taller than the original catwalk (above); stakes into the ground. Does not connect to other catwalk items. 10' long. 39" H x 23" W.

http://amos.shop.com/amos/cc/pcd/10911423/prd/16776361/ccsyn/260

my mother made something similar out of chicken wire for her sheltie to use when she was away at work (the sheltie could scale any fence, so a top was needed for her run). My friend who owns meerkats also has made something similar out of wire mesh. The hawks from nearby Joshua tree national monument have tried, but they've never scratched a single meerkat.